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1212120100020 = 223536315563757
BaseRepresentation
bin10001101000110111111…
…111001110110010110100
311021212200201210222120210
4101220313333032302310
5124324410221200040
62324501300225420
7153400315565424
oct21506777166264
94255621728523
101212120100020
1142806a218685
12176b0069b270
138a3c15acb1b
144294a08a484
15217e3c81480
hex11a37fcecb4

1212120100020 has 48 divisors (see below), whose sum is σ = 3394871601408. Its totient is φ = 323142948480.

The previous prime is 1212120100019. The next prime is 1212120100043. The reversal of 1212120100020 is 200010212121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1212120099969 and 1212120100005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2564019 + ... + 2999738.

It is an arithmetic number, because the mean of its divisors is an integer number (70726491696).

Almost surely, 21212120100020 is an apocalyptic number.

1212120100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212120100020 is an abundant number, since it is smaller than the sum of its proper divisors (2182751501388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212120100020 is a wasteful number, since it uses less digits than its factorization.

1212120100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567400 (or 5567398 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1212120100020 its reverse (200010212121), we get a palindrome (1412130312141).

The spelling of 1212120100020 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 3631 7262 10893 14524 18155 21786 36310 43572 54465 72620 108930 217860 5563757 11127514 16691271 22255028 27818785 33382542 55637570 66765084 83456355 111275140 166912710 333825420 20202001667 40404003334 60606005001 80808006668 101010008335 121212010002 202020016670 242424020004 303030025005 404040033340 606060050010 1212120100020